Classic Mode

Star Tech Journal

Issue: 1982-January - Vol 3 Issue 11

S*TJ JANUARY 1982 11
the factory and should not have to be touched. Any attempt to readjust these pots should be followed
by measuring and resetting the+ 5 and/or+ 12 volts.
LOGIC BOARDS/HARDWARE - There are three boards located on the back door of the cabinet.
1) Video Processor PCB - performs and displays all screen functions (Basic Timing).
Description
No.
Location
Processor
6809
1
U 82
Screen RAM
4116
3 2
Upper right quadrant
6514
2
U 85, U 86
Battery RAM
CRT Controller
68A45
1
U 18
Crystal
20MHZ
1
Between U 7 and U 23
Battery
3.6VNicad
1
Bottom middle of PCB
2) ROM/I.O. PCB - contains all program and sound proms, also all coin door and
control panel interface controls.
No.
( on "QIX")
Location
Description
U3 thru U19 except U6 & U15
Program Proms
14
2716
1
U27
Sound Proms
2716
Ull, U20, U30
IO Ports
6821
3
Next to Connectors
Output Driver
TIP 120
11
Transistors
3) Data Sound PCB- synchronizes all game operations and the generation of all audio.
Description
No.
Location
Data Processor
6809
1
U2
Sound Processor
6802
1
U5
7.3728MHz
1
Bottom middle of PCB
Crystal
Sound PIAs
6821
3
U7, U8, U20
Audio Amps
TDA2002
2
U29, U30
HARDWARE COMMENTS:
As can be seen, the board set and hardware used in "QIX" are somewhat similar to that of Williams
"DEFENDER". Thesameprocessor(6809)andalargenumberof4116 display RAMs with a
separate PROM and sound board are the principle similarities.
However, the use of three microprocessors gives this system great flexibility and makes it quite
unique. Only a portion of what this board system can do is used in "QIX". Later games may
incorporate even more spectacular graphics and audio. (Provisions for speech are already
incorporated in PROM and audio boards.)
MONITORS-Themonitorsusedin "QIX" are the same asthoseusedinmostU.S.
manufactured games. They include:
Electrohome - G 07-904 ( 19 ,, C 1 )
G 07-907
or
( 19 ,, C 1 )
Wells Gardner- 19K 4601/-06
19K 4653/55/56
or
GAME INPUTS - All inputs enter the ROM/I.O. Board.
Location
Switch
Pin No. Board Input Wire Color IC Pin Input
Coin Door
Bm
Ull 14
Left Coin
115-5
2
Coin Door
Right Coin
115-6
Red
Ull 15
3
Coin Door
Tilt
Org
Ull 17
115-8
4
Coin Door
Adv. Test
115-1
Yel
Ull 10
5
Coin Door
Adv. Sub. Test
Gm
Ull 11
115-2
6
Test Up
Coin Door
115-3
Blu
Ul 1 12
7
Coin Door
Test Down
Vio
Ul 1 13
115-4
8
1 oystick Left
Control Panel
2
116-3
Bm
U20 5
Control
Panel
1 oystick Down
116-4
Red
U20 4
3
°
°
S*TJ JANUARY 1982 12
Switch
Joystick Up
Joystick Right
Fast Draw
2 Player Select
Slow Draw
1 Player Select
Location
Control Panel
Control Panel
Control Panel
Control Panel
Control Panel
Control Panel
Pin No.
4
5
6
7
8
9
Board Input Wire Color
Org
J16-5
Yel
Jl6-6
Vio
Jl6-7
Jl6-8
Blu
J16-9
Gm
Gry
116-10
IC Pin Input
U20 2
U20 3
U20 6
U20 7
U20 9
U20 8
NOTES:
The ground for coin door switches is J 15 pin 1 O; for control panel switches, J 16 pin 1.
The Memory Protect is a normally closed interlock switch which is located on the
front door. When the front door is closed the switch shorts J 19 pin 1 to J 19 pin 2 on
the Video Processor P.C.B. This grounds pin 13 on LC. Ul02, disabling it and
effectively preventing anything from being written into the bookkeeping RAM.
*
*
GAME OUTPUTS - The outputs eminate from each of the three boards.
1) Video Processor PCB
Destination
Output
Function
Pin
Monitor Pin 1
J2
Horizontal Sync
9
.1
Monitor Pin2
J2
Vertical Sync
Monitor Pin4
J2
10
Blue Video
Monitor Pin5
J2
Green Video
11
Monitor Pin6
J2
14
Red Video
Not Used
Composite Sync
J2
2
Monitor Pin 3
J2
4
Ground/Shield
2) ROM/1.O. PCB
Destination
Function
Output
- Pin
Front
Door
Coin Lockout
J16
11
Front Door
12
Coin Lockout
J16
3) Data Sound PCB
Pin
Function
Destination
Output
Right Speaker
1
Audio Out+
J7
Right Speaker
Audio Out -
2
J7
Left Speaker
J7
Audio Out+
3
Audio Out -
Left Speaker
J7
4
External Volume Control
Not Used
J8
1
Not Used
External Volume Control
J8
3
Not Used
External
Volume
Control
J8
5
AUDIO COMMENTS:
As seen in the chart listing outputs, there are two 8 ohm speakers for simulated stereo sound mounted
in the top of the cabinet. Volume can only be adjusted using pot R9 on the Data Sound Board. There is,
however, a connector (J8) on the Data Sound Board which could be used to connect an external
volume control pot on later games.
SELF TEST/BOOKKEEPING
The Self Test procedure is performed using the two switches located on the inside of the coin door, and
the Self Test Button and the LEDs on the Video Board. Self Test is very thorough, capable of checking
memory devices, on the various boards as well as generating a pattern for alignment and
convergence of the monitor.
All bookkeeping totals ( although a coin meter can be easily installed) and option settings are also
programmed in or read out of the CMOS RAM during self test. The four position dip switch and pot
R25 on the Data Sound PCB are unused at this time and have no effect on the game. For detailed
descriptions of Self Test and how to determine failing components or to program in desired options
see the "QIX" game manual.

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